Which versions of Jwt Attack are affected by CVE-2025-25291?

Organizations using ruby-saml face critical risk from CVE-2025-25291, a signature bypass vulnerability rated CVSS 9.3.. A patch is available.

Is there a public PoC exploit available for CVE-2025-25291?

Yes, a public proof-of-concept exploit is available for CVE-2025-25291. Prioritise patching immediately. EPSS: 13.8%.

How to fix or mitigate CVE-2025-25291?

Within 24 hours: Identify all affected systems running ruby-saml and apply vendor patches immediately. Vendor patch is available.

Jwt Attack CVE-2025-25291

Q: What is the CVSS score of CVE-2025-25291?

CVE-2025-25291 has a CVSS 4.0 base score of 9.3 (Critical). CVSS vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X. EPSS exploitation probability: 13.8%.

CRITICAL

Improper Verification of Cryptographic Signature (CWE-347)

2025-03-12 security-advisories@github.com

Jwt Attack Authentication Bypass Omniauth Saml Ruby Saml Storagegrid

9.3

CVSS 4.0 · GitHub Advisory

Severity by source

GitHub Advisory PRIMARY

9.3 CRITICAL

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Primary rating from GitHub Advisory · only source for this CVE.

CVSS VectorGitHub Advisory

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Lifecycle Timeline

Analysis Generated

Mar 28, 2026 - 18:31 vuln.today

Patch released

Mar 28, 2026 - 18:31 nvd

Patch available

PoC Detected

Nov 03, 2025 - 20:17 vuln.today

Public exploit code

CVE Published

Mar 12, 2025 - 21:15 nvd

CRITICAL 9.3

DescriptionGitHub Advisory

ruby-saml provides security assertion markup language (SAML) single sign-on (SSO) for Ruby. An authentication bypass vulnerability was found in ruby-saml prior to versions 1.12.4 and 1.18.0 due to a parser differential. ReXML and Nokogiri parse XML differently; the parsers can generate entirely different document structures from the same XML input. That allows an attacker to be able to execute a Signature Wrapping attack. This issue may lead to authentication bypass. Versions 1.12.4 and 1.18.0 fix the issue.

AnalysisAI

ruby-saml provides security assertion markup language (SAML) single sign-on (SSO) for Ruby. Rated critical severity (CVSS 9.3), this vulnerability is remotely exploitable, no authentication required, low attack complexity. Public exploit code available and EPSS exploitation probability 13.8%.

Technical ContextAI

This vulnerability is classified under CWE-347. ruby-saml provides security assertion markup language (SAML) single sign-on (SSO) for Ruby. An authentication bypass vulnerability was found in ruby-saml prior to versions 1.12.4 and 1.18.0 due to a parser differential. ReXML and Nokogiri parse XML differently; the parsers can generate entirely different document structures from the same XML input. That allows an attacker to be able to execute a Signature Wrapping attack. This issue may lead to authentication bypass. Versions 1.12.4 and 1.18.0 fix the issue. Affected products include: Omniauth Omniauth Saml, Onelogin Ruby-Saml, Netapp Storagegrid.

RemediationAI

A vendor patch is available. Apply the latest security update as soon as possible. Apply vendor patches when available. Implement network segmentation and monitoring as interim mitigations.